Method and device used in wireless communication

Abstract

The invention discloses a method and a device used in wireless communication. A first node receives a first RRC signaling, wherein the first RRC signaling indicates at least one candidate cell and at least one corresponding candidate configuration; evaluating whether a first set of conditions for a second cell is satisfied, the second cell being one of the at least one candidate cell; executing a first action; wherein the first action depends on that the first set of conditions for the second cell is satisfied and a first timer; when the first timer is not running, the first action is to apply the candidate configuration for the second cell; the first condition set comprises that the channel quality of the first cell is poorer than a first threshold value, and the first cell is a service cell of the first node; the first timer is directed to the first cell and the second cell pair. According to the invention, frequent back-and-forth switching between two cells can be effectively avoided.

Description

Technical Field

[0001] The present application relates to methods and devices in wireless communication systems, and more particularly to methods and devices for supporting cell switching in wireless communication. Background Art

[0002] In the future, the application scenarios of wireless communication systems will become more and more diversified, and different application scenarios will put forward different performance requirements for the system. In order to meet the different performance requirements of various application scenarios, the 3GPP (3rd Generation Partner Project) RAN (Radio Access Network) #72 plenary meeting decided to study the new radio technology (NR) (or 5G), and the WI (Work Item) of the new radio technology was passed at the 3GPP RAN #75 plenary meeting, and the standardization work on NR began.

[0003] In the new air interface technology, providing effective mobility support for cell switching is one of the most basic requirements. The basic requirements for cell switching are robustness and low switching delay to reduce the impact on services. In order to adapt to various application scenarios and meet different needs, 3GPP has been evolving cell switching technology. Summary of the invention

[0004] When a UE (User Equipment) moves from the coverage of one cell to the coverage of another cell, it is necessary to change the UE's service cell, that is, switch from the source cell to the target cell. Existing cell switching is usually based on L3 (Layer 3) measurement, and is triggered by the network sending RRC (Radio Resource Control) signaling including reconfiguration with synchronization. The cell switching implemented in L3 has the characteristics of long delay and long service interruption time. In order to overcome the above shortcomings, the 3GPP (3rd Generation Partner Project) RAN (Radio Access Network) #94e plenary meeting decided to start the WI (Work Item) standardization work on the cell switching technology based on L1 / L2 (Layer 1 / Layer 2). The design goal of the cell switching based on L1 / L2 is to achieve fast switching of the UE's service cell. In the cell switching triggered by the network, there is also the problem that the robustness of RRC signaling cannot be guaranteed. To overcome the robustness problem, 3GPP RAN introduced UE-triggered L3 cell switching, namely Conditional Handover (CHO) and other technologies in Rel (version)-17, but these technologies are still implemented based on L3.

[0005] The inventors found through research that the combination of UE-triggered cell switching and L1 / L2-based cell switching needs further research. In response to the above problems, the present application discloses a solution. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other arbitrarily. Although the original intention of the present application is for the Uu air interface, the present application can also be used for the PC5 port. Further, although the original intention of the present application is for the cell switching scenario, the present application is also applicable to other scenarios facing similar problems, including but not limited to multi-antenna systems, multi-TRP (Transmission Reception Point, sending and receiving nodes) systems, capacity enhancement systems, short-range communication systems, unlicensed frequency domain communications, IoT (Internet of Things), URLLC (Ultra Reliable Low Latency Communication, ultra-robust low-latency communication) networks, vehicle networking communications, relay communications, dual-connectivity (dual-connectivity, DC), multi-connectivity (multi-connectivity, MC), etc., to achieve similar technical effects. In addition, the use of a unified solution for different scenarios (including but not limited to V2X scenarios and communication scenarios between terminals and base stations) also helps to reduce hardware complexity and costs. In particular, the interpretation of the terminology, nouns, functions, and variables in this application (unless otherwise specified) can refer to the definitions in the 3GPP specification protocols TS38 series and TS37 series.

[0006] The present application discloses a method in a first node used for wireless communication, characterized by comprising:

[0007] receiving a first RRC signaling indicating at least one candidate cell and at least one corresponding candidate configuration;

[0008] evaluating whether a first set of conditions for a second cell is satisfied, the second cell being one of the at least one candidate cell;

[0009] Perform the first action;

[0010] The first action depends on the first set of conditions for the second cell being satisfied and a first timer; when the first timer is not running, the first action is to apply the candidate configuration for the second cell; the first set of conditions includes that the channel quality of the first cell is worse than a first threshold, and the first cell is a serving cell of the first node; the first timer is for the first cell and the second cell pair.

[0011] As an embodiment, the second cell is a candidate cell for cell switching of the first node.

[0012] As an embodiment, when the first condition set for the second cell is met, the second cell is a target cell for cell switching.

[0013] As an embodiment, the first RRC signaling includes candidate cells for cell switching and corresponding candidate configurations.

[0014] As an embodiment, an evaluation result of whether the first condition set for the second cell is satisfied is used to determine whether to trigger a cell handover to the second cell.

[0015] As an embodiment, the above method can implement cell switching triggered by UE.

[0016] As an embodiment, the cell switching triggered by the UE can speed up the cell switching process and reduce the cell switching delay.

[0017] As an embodiment, the UE-triggered cell switching can omit the signaling of the network-triggered cell switching.

[0018] As an embodiment, the cell switching triggered by the UE is based on the result of UE measurement and evaluation, which can improve the robustness of the switching.

[0019] As an embodiment, the problem to be solved by the present application is: in a cell handover triggered by a UE, frequent handovers between two cells waste signaling overhead and increase the risk of handover failure.

[0020] As an embodiment, the solution of the present application is: using the first timer to indicate the shortest time interval required for switching back and forth between two cells.

[0021] As an embodiment, the present application can effectively avoid frequent switching back and forth between two cells, that is, effectively avoid the ping-pong effect.

[0022] As an embodiment, the above method is applicable to cell switching triggered by UE.

[0023] As an embodiment, the cell switching triggered by the UE includes CHO (Conditional Handover).

[0024] As an embodiment, the UE-triggered cell switching includes conditional LTM (L1 / L2-triggered mobility).

[0025] As an embodiment, the conditional LTM means LTM triggered by the UE.

[0026] As an embodiment, the present application is applicable to a scenario in which the at least one candidate cell and the corresponding at least one candidate configuration are not released after the cell switching is successful.

[0027] As an embodiment, the present application is applicable to a subsequent conditional LTM scenario, that is, the UE can trigger a subsequent conditional LTM after the conditional LTM is successfully completed.

[0028] According to one aspect of the present application, it includes:

[0029] When the first timer is running, the first action includes at least one of monitoring a PDCCH on the first cell, monitoring a PDCCH for scheduling the first cell, and sending a PRACH on the first cell.

[0030] As an embodiment, when the first timer is running, the candidate configuration for the second cell is not applied.

[0031] As an embodiment, in the above method, the first node maintains the first cell as a serving cell, that is, does not trigger a cell handover from the first cell to the second cell.

[0032] As an embodiment, the above method avoids frequent switching back and forth between two cells.

[0033] According to one aspect of the present application, it includes:

[0034] While the first timer is running, the first action includes sending a first message on the first cell.

[0035] As an embodiment, when the first timer is running, the candidate configuration for the second cell is not applied.

[0036] As an embodiment, the above method avoids frequent switching back and forth between two cells.

[0037] As an embodiment, the above method indicates to the network through the first message.

[0038] As an embodiment, the above method can enable the network to optimize the configuration of cell switching after receiving the first message to avoid frequent cell switching.

[0039] According to one aspect of the present application, it includes:

[0040] evaluating whether a second set of conditions for the first cell is met;

[0041] In response to the second set of conditions for the first cell being met, applying the candidate configuration for the first cell and sending a first radio signal on the first cell, the first radio signal carrying second RRC signaling;

[0042] Starting the first timer as a response to successful sending of the second RRC signaling;

[0043] The second condition set includes that the channel quality of the first cell is worse than a second threshold, the second cell is a service cell of the first node; and the first cell is a cell of the at least one candidate cell other than the second cell.

[0044] As an embodiment, after the above method switches from the second cell to the first cell, the first timer starts running, and the first timer indicates the shortest time length required to switch from the first cell to the second cell again.

[0045] As an embodiment, when the candidate configuration for the first cell is applied, the candidate configuration for the second cell is not released.

[0046] According to one aspect of the present application, it includes:

[0047] When the at least one candidate cell and the corresponding at least one candidate configuration are released, the first timer is stopped.

[0048] According to one aspect of the present application, it includes:

[0049] When the at least one candidate cell and the corresponding at least one candidate configuration are released, the first timer is cleared.

[0050] As an embodiment, the first timer is only applicable to the cell switching scenario triggered by the UE.

[0051] As an embodiment, the first timer is only applicable to the scenario where the cell switching is triggered by the UE and the at least one candidate cell and the corresponding at least one candidate configuration are not released after the cell switching is successful.

[0052] According to one aspect of the present application, it includes:

[0053] When a cell switching command is received, the first timer is stopped.

[0054] As an embodiment, the above method can avoid affecting the cell switching triggered by the network.

[0055] According to one aspect of the present application, it includes:

[0056] In response to receiving the first RRC signaling, sending a first random access sequence on the second cell;

[0057] A first timing advance is monitored in the first cell or in the second cell, where the first timing advance is for the first random access sequence.

[0058] As an embodiment, the above method can speed up obtaining the first timing advance by sending the first random access sequence on the second cell after receiving the first RRC signaling, that is, speed up obtaining uplink synchronization of the cell switching candidate cell and reduce the cell switching delay.

[0059] According to one aspect of the present application, it includes:

[0060] When the first condition set is not met, the first timing advance is monitored on the first cell; when the first timing advance is not received before the first condition set is met, and the first condition set is met, and the first timer is not running, the first timing advance is monitored on the second cell.

[0061] As an embodiment, the above method determines whether to monitor the first timing advance in the first cell or in the second cell according to whether the first condition set is satisfied, which can improve the robustness of the first timing advance reception.

[0062] The present application discloses a method used in a second node of wireless communication, characterized by comprising:

[0063] A first RRC signaling is sent, wherein the first RRC signaling indicates at least one candidate cell and at least one corresponding candidate configuration; wherein whether a first condition set for a second cell is satisfied is evaluated, and the second cell is one of the at least one candidate cell; a first action is performed; the first action depends on the first condition set for the second cell being satisfied and a first timer; when the first timer is not running, the first action is to apply the candidate configuration for the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is a service cell of the first node; the first timer is for the first cell and the second cell pair.

[0064] According to one aspect of the present application, it includes:

[0065] When the first timer is running, the first action includes at least one of monitoring a PDCCH on the first cell, monitoring a PDCCH for scheduling the first cell, and sending a PRACH on the first cell.

[0066] According to one aspect of the present application, it includes:

[0067] While the first timer is running, the first action includes sending a first message on the first cell.

[0068] According to one aspect of the present application, it includes:

[0069] receiving a first wireless signal on the first cell, where the first wireless signal carries a second RRC signaling;

[0070] In which, whether a second condition set for the first cell is met is evaluated; in response to the second condition set for the first cell being met, the candidate configuration for the first cell is applied; in response to the second RRC signaling being successfully sent, the first timer is started; the second condition set includes that the channel quality of the first cell is worse than a second threshold, the second cell is a service cell of the first node; the first cell is one of the at least one candidate cell.

[0071] According to one aspect of the present application, it includes:

[0072] When the at least one candidate cell and the corresponding at least one candidate configuration are released, the first timer is stopped.

[0073] According to one aspect of the present application, it includes:

[0074] When a cell handover command is received, the first timer is stopped.

[0075] According to one aspect of the present application, it includes:

[0076] receiving a first random access sequence on the second cell, where the first random access sequence is triggered by the first RRC signaling;

[0077] A first timing advance is sent on the first cell; or, the first timing advance is sent on the second cell, where the first timing advance is for the first random access sequence.

[0078] According to one aspect of the present application, it includes:

[0079] Sending a first timing advance on the first cell, the first timing advance being for a first random access sequence;

[0080] In which, as a response to the first RRC signaling being received, the first random access sequence is sent on the second cell.

[0081] According to one aspect of the present application, it includes:

[0082] When the first condition set is not met, the first timing advance is monitored on the first cell; when the first timing advance is not received before the first condition set is met, and the first condition set is met, and the first timer is not running, the first timing advance is monitored on the second cell.

[0083] The present application discloses a first node used for wireless communication, characterized in that it includes:

[0084] A first receiver receives a first RRC signaling, where the first RRC signaling indicates at least one candidate cell and at least one corresponding candidate configuration;

[0085] A first processor is configured to evaluate whether a first condition set for a second cell is satisfied, wherein the second cell is one of the at least one candidate cell; and perform a first action;

[0086] The first action depends on the first set of conditions for the second cell being satisfied and a first timer; when the first timer is not running, the first action is to apply the candidate configuration for the second cell; the first set of conditions includes that the channel quality of the first cell is worse than a first threshold, and the first cell is a serving cell of the first node; the first timer is for the first cell and the second cell pair.

[0087] The present application discloses a second node used for wireless communication, characterized in that it includes:

[0088] A first transceiver sends a first RRC signaling, where the first RRC signaling indicates at least one candidate cell and at least one corresponding candidate configuration;

[0089] In which, whether a first condition set for a second cell is met is evaluated, and the second cell is one of the at least one candidate cell; a first action is performed; the first action depends on the first condition set for the second cell being met and a first timer; when the first timer is not running, the first action is to apply the candidate configuration for the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is a service cell of the first node; the first timer is for the first cell and the second cell pair. BRIEF DESCRIPTION OF THE DRAWINGS

[0090] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0091] Figure 1 A signal processing flow chart in a first node according to an embodiment of the present application is illustrated;

[0092] Figure 2 A schematic diagram illustrating a network architecture according to an embodiment of the present application is illustrated;

[0093] Figure 3 A schematic diagram illustrating a wireless protocol architecture of a user plane and a control plane according to an embodiment of the present application;

[0094] Figure 4 A hardware module schematic diagram of a communication device according to an embodiment of the present application is illustrated;

[0095] Figure 5 An example of a wireless signal transmission flow chart according to an embodiment of the present application is provided;

[0096] Figure 6 An example flowchart of monitoring a first timing advance in a first cell or a second cell according to an embodiment of the present application is provided;

[0097] Figure 7 An example flowchart of monitoring PDCCH or sending PRACH according to an embodiment of the present application is provided;

[0098] Figure 8 An example flowchart of sending a first message according to an embodiment of the present application is provided;

[0099] Fig. 9 A schematic diagram illustrating sending a first wireless signal and starting a first timer according to an embodiment of the present application is illustrated;

[0100] Fig.10 A schematic diagram illustrating the relationship between cell switching and a first timer according to an embodiment of the present application is illustrated;

[0101] Fig.11 An example structural block diagram of a processing device in a first node according to an embodiment of the present application is shown;

[0102] Fig.12 The structural block diagram of the processing device in the second node according to an embodiment of the present application is illustrated. DETAILED DESCRIPTION

[0103] The technical solution of the present application will be further described in detail below in conjunction with the accompanying drawings. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be arbitrarily combined with each other.

[0104] Example 1

[0105] Embodiment 1 illustrates a signal processing flow chart in a first node according to an embodiment of the present application, as shown in the attached Figure 1 shown.

[0106] In embodiment 1, the first node 100 receives a first RRC signaling in step 101, and the first RRC signaling indicates at least one candidate cell and at least one corresponding candidate configuration; in step 102, it is evaluated whether a first condition set for a second cell is met, and the second cell is one of the at least one candidate cell; in step 103, a first action is performed; wherein the first action depends on the first condition set for the second cell being met and a first timer; when the first timer is not running, the first action is to apply the candidate configuration for the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is a service cell of the first node; the first timer is for the first cell and the second cell pair.

[0107] As an embodiment, a first RRC signaling is received on a serving cell of the first node.

[0108] As an embodiment, the service cell of the first node includes a SpCell (Special Cell).

[0109] As an embodiment, the service cell of the first node includes a PCell (Primary Cell).

[0110] As an embodiment, the first RRC signaling is RRCReconfiguration (RRC reconfiguration).

[0111] As an embodiment, the first RRC signaling is LTMConfig (LTM configuration).

[0112] As an embodiment, the first RRC signaling includes condLTMConfig (conditional LTM configuration).

[0113] As an embodiment, the first RRC signaling includes condRRCReconfig (conditional RRC reconfiguration).

[0114] As an embodiment, the first RRC signaling includes ltm-ReferenceConfiguration (LTM reference configuration).

[0115] As an embodiment, the first RRC signaling includes LTM-Candidate.

[0116] As an embodiment, the first RRC signaling includes ltm-CandidateConfig (LTM candidate configuration).

[0117] As an embodiment, the name of the first RRC signaling includes cond (condition).

[0118] As an embodiment, the first RRC signaling indicates at least one candidate cell and at least one corresponding candidate configuration.

[0119] As an embodiment, the first RRC signaling includes the at least one candidate cell and the corresponding at least one candidate configuration.

[0120] As an embodiment, each candidate cell in the at least one candidate cell corresponds to a candidate configuration in the at least one candidate configuration.

[0121] As an embodiment, the at least one candidate cell is configured according to a measurement report reported by the first node.

[0122] As an embodiment, the measurement report is an L3 (layer 3) measurement report.

[0123] As an embodiment, the measurement report is an L1 (layer 1) measurement report.

[0124] As an embodiment, the at least one candidate cell is for cell switching.

[0125] As an embodiment, the at least one candidate cell is for a cell change.

[0126] As an embodiment, the at least one candidate cell is CHO.

[0127] As an embodiment, the at least one candidate cell is for conditional LTM.

[0128] As an embodiment, the cell switching includes cell switching of protocol layers below layer 3.

[0129] As an embodiment, the first RRC signaling configures a candidate configuration for each candidate cell in the at least one candidate cell, and the candidate configuration is indicated by a candidate identifier (candidate ID).

[0130] As an embodiment, the candidate configuration is applied to CHO.

[0131] As an embodiment, the candidate configuration is applied to conditional LTM.

[0132] As an embodiment, the candidate configuration is applied to CPC (Conditional PSCell Change, conditional primary SCG (Secondary Cell Group) cell change).

[0133] As an embodiment, the candidate configuration is applied to CPA (Conditional PSCell Addition, conditional SCG cell addition).

[0134] As an embodiment, it is evaluated whether the first condition set for the second cell is satisfied.

[0135] As an embodiment, in response to receiving the first RRC signaling, an evaluation is started as to whether the first condition set for the second cell is met.

[0136] As an embodiment, after the conditional LTM to a cell other than the second cell in the at least one candidate cell is completed, it continues to evaluate whether the first condition set for the second cell is satisfied.

[0137] As an embodiment, the second cell is one of the at least one candidate cell.

[0138] As an embodiment, the second cell waits to become a service cell of the first node.

[0139] As an embodiment, the second cell is an SCell (secondary cell) of the first node.

[0140] As an embodiment, the first RRC signaling includes an identifier of the second cell.

[0141] As an embodiment, the identifier of the second cell is PhysCellId (physical cell identifier).

[0142] As an embodiment, the identifier of the second cell is candidateCellID (candidate cell identifier).

[0143] As an embodiment, the first set of conditions for the second cell is network configured.

[0144] As an embodiment, the first condition set includes at least one condition.

[0145] As an embodiment, the first condition set being satisfied means that all conditions in the first condition set are satisfied.

[0146] As an embodiment, the first condition set not being satisfied means that any condition in the first condition set is not satisfied.

[0147] As an embodiment, the evaluating whether the first condition set for the second cell is satisfied includes: performing channel measurement for the second cell and evaluating whether the first condition set is satisfied.

[0148] As an embodiment, the first RRC signaling indicates that the candidate configuration for the second cell includes a measurement configuration for the second cell.

[0149] As an embodiment, the measurement configuration for the second cell includes a measurement identifier (measurementID), and the first node performs measurement according to a measurement object (measurement object) indicated by the measurement identifier to determine whether the first condition set is met.

[0150] As an embodiment, the first condition set includes conditions for executing conditional LTM.

[0151] As an embodiment, the first condition set includes an event for executing a conditional LTM.

[0152] As an embodiment, the first condition set includes conditions for executing CHO.

[0153] As an embodiment, the first action depends on the first set of conditions for the second cell being met and a first timer.

[0154] As an embodiment, the first action depends on whether the first set of conditions for the second cell is satisfied and the first timer, including: whether to execute the first action depends on whether the first set of conditions for the second cell is satisfied and the first timer, and the first action is to apply the candidate configuration for the second cell.

[0155] As a sub-embodiment of the above embodiment, when the first condition set for the second cell is met and the first timer is not running, the first action is performed.

[0156] As a sub-embodiment of the above embodiment, when the first condition set for the second cell is met and the first timer is running, the first action is not performed.

[0157] As an embodiment, the first action depends on the first set of conditions for the second cell being met and a first timer, including: as a response to the first set of conditions for the second cell being met, performing the first action, the first action depends on the first timer.

[0158] As a sub-embodiment of the above embodiment, when the first timer is not running, the first action is to apply the candidate configuration for the second cell.

[0159] As a sub-embodiment of the above embodiment, when the first timer is not running, the first action is determined by the UE itself.

[0160] As a sub-embodiment of the above embodiment, when the first timer is not running, the first action depends on UE implementation.

[0161] As an embodiment, when the first action is determined by the UE itself, or when the first action depends on the UE to be implemented, the first action includes continuing to evaluate the first condition set for the second cell.

[0162] As an embodiment, the first action depends on whether the first condition set for the second cell is satisfied and a first timer includes: the first action depends on whether the first condition set for the second cell is satisfied and whether the first timer is running.

[0163] As a sub-embodiment of the above embodiment, when the first condition set for the second cell is met and the first timer is not running, the first action is to apply the candidate configuration for the second cell.

[0164] As a sub-embodiment of the above embodiment, when the first condition set for the second cell is met and the first timer is running, the first action is to apply the candidate configuration for the third cell, and the third cell is one of the at least one candidate cell; the third condition set for the third cell is met, and the third condition set includes that the channel quality of the first cell is worse than a fourth threshold.

[0165] As a sub-embodiment of the above embodiment, when the first condition set for the second cell is met and the first timer is running, the first action is to continue to evaluate whether the condition set for performing conditional LTM for a cell other than the second cell in the at least one candidate cell is met.

[0166] As an embodiment, the third condition set includes an event that triggers the condition LTM to the third cell.

[0167] As an embodiment, the third condition set includes a condition for triggering the LTM to the third cell.

[0168] As an embodiment, the fourth threshold is configurable.

[0169] As an embodiment, the applying the candidate configuration for the second cell includes: the second cell becomes a serving cell of the first node.

[0170] As an embodiment, the applying the candidate configuration for the second cell includes: applying the candidate configuration for the second cell to perform at least one of uplink transmission and downlink reception.

[0171] As an embodiment, when the candidate configuration for the second cell is applied, the candidate configuration for the first cell is not released.

[0172] As an embodiment, when the candidate configuration for the second cell is applied, the first cell becomes a cell switching candidate cell for the first node.

[0173] As a sub-embodiment of the above two embodiments, the candidate configuration for the first cell is stored.

[0174] As a sub-embodiment of the above two embodiments, the candidate configuration for the first cell is stopped from being applied.

[0175] As an embodiment, the first RRC signaling indicates the first cell and the candidate configuration of the first cell.

[0176] As an embodiment, the first condition set includes that the channel quality of the first cell is worse than a first threshold.

[0177] As an embodiment, the first cell is a service cell of the first node.

[0178] As an embodiment, the first cell is a source cell of cell switching.

[0179] As an embodiment, the first threshold is a measurement value.

[0180] As an embodiment, the first threshold is a configuration value.

[0181] As an embodiment, the first threshold is a value obtained by linearly processing a measurement value and an offset value, and the offset value is configurable.

[0182] As an embodiment, the first condition set includes one condition, and the one condition is that the channel quality of the first cell is worse than the first threshold; wherein the first threshold is the channel quality of the second cell.

[0183] As an embodiment, the first condition set includes a condition, wherein the channel quality of the first cell is worse than the first threshold; wherein the first threshold is the difference between the channel quality of the second cell and an offset value, and the offset value is configured.

[0184] As an embodiment, the first condition set includes two conditions, the first of the two conditions being that the channel quality of the first cell is worse than the first threshold; the second of the two conditions being that the channel quality of the second cell is better than a third threshold; wherein the first threshold is configured by the network, and the third threshold is configured by the network.

[0185] As an embodiment, when the channel quality of one cell is less than a threshold, the channel quality of the one cell is worse than the threshold.

[0186] As an embodiment, when the channel quality of one cell is greater than a threshold, the channel quality of the one cell is better than the threshold.

[0187] As an embodiment, the channel quality of a cell is represented by RSRP (Reference Signal Received Power), or RSRQ (Reference Signal Received Quality), or RSSI (Received Signal Strength Indicator), or SINR (Signal to Interference & Noise Ratio).

[0188] As an embodiment, the channel quality of a cell is obtained by measuring a reference signal of the cell.

[0189] As an embodiment, the cell measurement is performed at L3 (layer 3).

[0190] As an example, cell measurement is performed at a protocol layer below L3 (Layer 3).

[0191] As an example, cell measurement is performed at L1 (Layer 1).

[0192] As an example, the reference signal is an SSB (Synchronization Signal Block).

[0193] As an example, the reference signal is an SSB (Synchronization Signals / Physical Broadcast Channel).

[0194] As an example, the reference signal is a CSI-RS (Channel Status Information-Reference Signal).

[0195] As an example, the channel quality of a cell is obtained after linear processing of the measurement value of the reference signal of the cell and a configured offset value.

[0196] As a sub-example of the above example, the configured offset value includes at least one of an offset value specific to a measurement object, an offset value specific to a cell, an offset value for an event, and a hysteresis parameter value for an event.

[0197] As an example, the channel quality of the first cell being worse than the first threshold includes: Mp < Mn; where Mp is the channel quality of the first cell; the first threshold is Mn, and Mn is the channel quality of the second cell.

[0198] As an example, the channel quality of the first cell being worse than the first threshold includes: Mp < Thresh1; where Mp is the channel quality of the first cell; the first threshold is Thresh1, and Thresh1 is configured.

[0199] As an example, the channel quality of the second cell being better than the third threshold includes: Mn > Thresh2; where Mn is the channel quality of the second cell; the third threshold is Thresh2, and Thresh2 is configured.

[0200] As an example, the channel quality of the first cell being worse than the first threshold includes: Mn + Ofn + Ocn – Hys > Mp + Ofp + Ocp + Off; where the channel quality of the first cell is Mp + Ofp + Ocp + Off; the first threshold is Mn + Ofn + Ocn – Hys; Mp is the measurement result for the first cell; Ofp is the offset value specific to the measurement object for the first cell; Ocp is the cell-specific offset value for the first cell; Off is the offset value for the event; Mn is the measurement result for the second cell; Ofn is the offset value specific to the measurement object for the second cell; Ocn is the cell-specific offset value for the second cell; Hys is the hysteresis parameter value for the event; when Mp and Mn are RSRP (Reference Signal Received Power), the units of Mp and Mn are dBm (decibel milliwatt); when Mp and Mn are RSRQ (Reference Signal Received Quality) or RS-SINR (Reference Signal-Signal to Interference & Noise Ratio), the units of Mp and Mn are dB (decibel); the units of Ofn, Ocn, Ofp, Ocp, Hys, and Off are dB.

[0201] As an example, the channel quality of the first cell being worse than the first threshold includes: Mp + Hys < Thresh1; where the channel quality of the first cell is Mp + Hys, the first threshold is Thresh1; Mp is the measurement result for the first cell; Hys is the hysteresis parameter value for the event; Thresh1 is configured.

[0202] As an example, the channel quality of the second cell being better than the third threshold includes: the channel quality of the second cell is Mn + Ofn + Ocn – Hys, the third threshold is Thresh2; where Mn is the measurement result for the second cell; Ofn is the offset value specific to the measurement object for the second cell; Ocn is the cell-specific offset value for the second cell; Hys is the hysteresis parameter value for the event; Thresh2 is configured.

[0203] As an embodiment, when the Mp and the Mn are RSRP, the units of the Mp and the Mn are dBm (decibel milliwatt); when the Mp and the Mn are RSRQ or RS (Reference Signal)-SINR, the units of the Mp and the Mn are dB (decibel); the units of the Ofn, the Ocn and the Hys are dB, the unit of the Threshold1 is the same as the unit of the Mp; the unit of the Threshold2 is the same as the unit of the Mn.

[0204] As an embodiment, the first timer is for a pair of the first cell and the second cell.

[0205] As an embodiment, the first timer is applied to a conditional LTM occurring between the first cell and the second cell.

[0206] As an embodiment, when entering the RRC_INACTIVE state or the RRC_IDLE state, the first timer is stopped.

[0207] As an embodiment, when the candidate configuration for the second cell is released, the first timer is stopped.

[0208] As a sub-embodiment of the above two embodiments, stopping the first timer includes: clearing the first timer.

[0209] As an embodiment, the first timer is maintained at the physical layer.

[0210] As an embodiment, the first timer is maintained in a MAC (Medium Access Control) sublayer.

[0211] As an embodiment, the first timer is maintained at the RRC layer.

[0212] As an embodiment, the expiration value of the first timer is configurable.

[0213] As an embodiment, the expiration value of the first timer is determined by the UE itself.

[0214] As an embodiment, the expiration value of the first timer is pre-configured or specified.

[0215] As an embodiment, the name of the first timer includes prohibit.

[0216] As an embodiment, the first timer is a prohibitTimer.

[0217] As an embodiment, the first timer is configured by the first RRC signaling.

[0218] As an embodiment, the first RRC signaling indicates setting (setup) the first timer.

[0219] As an embodiment, the first RRC signaling includes the expiration value of the first timer.

[0220] As an embodiment, the value of the first timer is set to 0 when the first timer is started; the value of the first timer is increased by 1 every time unit; when the value of the first timer is the expiration value, the first timer expires.

[0221] As an embodiment, the value of the first timer is set to the expiration value when the first timer is started; the value of the first timer is subtracted by 1 after each time unit; when the value of the first timer is 0, the first timer expires.

[0222] As an embodiment, the first timer runs after it is started and before it expires.

[0223] As an embodiment, the first timer stops running after expiration.

[0224] As an embodiment, one time unit includes 1 millisecond, or 1 second.

[0225] As an embodiment, a time unit includes a subframe, or a time slot, or a frame.

[0226] Example 2

[0227] Embodiment 2 illustrates a schematic diagram of a network architecture according to an embodiment of the present application, as shown in the attached Figure 2 shown. Figure 2A diagram of a network architecture 200 for NR 5G, LTE (Long-Term Evolution) and LTE-A (Long-Term Evolution Advanced) systems is illustrated. The NR 5G, LTE or LTE-A network architecture 200 may be referred to as 5GS (5G System) / EPS (Evolved Packet System) 200 or some other suitable terminology. The 5GS / EPS 200 may include one or more UEs (User Equipment) 201, NG-RAN (Next Generation Radio Access Network) 202, 5GC (5G Core Network) / EPC (Evolved Packet Core) 210, HSS (Home Subscriber Server) / UDM (Unified Data Management) 220 and Internet Services 230. The 5GS / EPS may be interconnected with other access networks, but these entities / interfaces are not shown for simplicity. As shown, 5GS / EPS provides packet switching services, however, those skilled in the art will readily appreciate that the various concepts presented throughout this application can be extended to networks providing circuit switching services or other cellular networks. NG-RAN includes NR Node B (gNB) 203 and other gNBs 204. gNB 203 provides user and control plane protocol terminations toward UE 201. gNB 203 can be connected to other gNBs 204 via an Xn interface (e.g., backhaul). gNB 203 may also be referred to as a base station, a base transceiver station, a radio base station, a radio transceiver, a transceiver function, a basic service set (BSS), an extended service set (ESS), a TRP (Transmission Reception Point), or some other suitable term. In a NTN (Non Terrestrial Network, non-terrestrial / satellite network) network, gNB 203 may be a satellite, an aircraft, or a ground base station relayed by a satellite. gNB 203 provides an access point to 5GC / EPC 210 for UE 201.Examples of UE 201 include cellular phones, smart phones, Session Initiation Protocol (SIP) phones, laptop computers, personal digital assistants (PDAs), satellite radios, global positioning systems, multimedia devices, video devices, digital audio players (e.g., MP3 players), cameras, game consoles, drones, aircraft, narrowband Internet of Things devices, machine type communication devices, land vehicles, cars, vehicle-mounted devices, vehicle-mounted communication units, wearable devices, or any other similar functional devices. Those skilled in the art may also refer to UE 201 as a mobile station, a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other suitable term. gNB203 is connected to 5GC / EPC210 via S1 / NG interface. 5GC / EPC210 includes MME (Mobility Management Entity) / AMF (Authentication Management Field) / SMF (Session Management Function) 211, other MME / AMF / SMF214, S-GW (Service Gateway) / UPF (User Plane Function) 212 and P-GW (Packet Data Network Gateway) / UPF213. MME / AMF / SMF211 is the control node that handles signaling between UE201 and 5GC / EPC210. ​​In general, MME / AMF / SMF211 provides bearer and connection management. All user IP (Internet Protocol) packets are transmitted through S-GW / UPF212, which itself is connected to P-GW / UPF213. P-GW provides UE IP address allocation and other functions. P-GW / UPF213 is connected to Internet service 230. Internet service 230 includes operator-corresponding Internet protocol services, which may specifically include Internet, Intranet, IMS (IP Multimedia Subsystem) and PS (Packet Switching) streaming services.

[0228] As an embodiment, the UE201 corresponds to the first node in this application.

[0229] As an embodiment, the NR node B203 corresponds to the second node in this application.

[0230] As an embodiment, the gNB203 is a macro cell base station.

[0231] As an embodiment, the gNB203 is a micro cell base station.

[0232] As an embodiment, the gNB203 is a pico cell base station.

[0233] As an embodiment, the gNB203 is a home base station (Femtocell).

[0234] As an embodiment, the gNB203 is a base station device that supports large delay difference.

[0235] As an embodiment, the gNB203 is a flying platform device.

[0236] As an embodiment, the gNB203 is a satellite device.

[0237] As an embodiment, the gNB203 is a testing device (e.g., a transceiver that simulates some functions of a base station, a signaling tester).

[0238] As an embodiment, the wireless link from the UE201 to the gNB203 is an uplink, and the uplink is used to perform uplink transmission.

[0239] As an embodiment, the wireless link from the gNB203 to the UE201 is a downlink, and the downlink is used to perform downlink transmission.

[0240] As an embodiment, the UE201 and the gNB203 are connected via a Uu interface.

[0241] Example 3

[0242] Embodiment 3 illustrates a schematic diagram of a wireless protocol architecture of a user plane and a control plane according to an embodiment of the present application, as shown in the attached figure. Figure 3 shown. Figure 3 is a schematic diagram illustrating an embodiment of a radio protocol architecture for a user plane 350 and a control plane 300, Figure 3The radio protocol architecture of the control plane 300 of the UE and gNB is shown in three layers: Layer 1, Layer 2, and Layer 3. Layer 1 (L1 layer) is the lowest layer and implements various PHY (physical layer) signal processing functions. The L1 layer will be referred to as PHY 301 in this article. Layer 2 (L2 layer) 305 is above PHY 301 and is responsible for the link between the UE and the gNB through PHY 301. The L2 layer 305 includes the MAC (Medium Access Control) sublayer 302, the RLC (Radio Link Control) sublayer 303, and the PDCP (Packet Data Convergence Protocol) sublayer 304, which terminate at the gNB on the network side. The PDCP sublayer 304 provides data encryption and integrity protection. The PDCP sublayer 304 also provides support for inter-zone mobility of UEs between gNBs. The RLC sublayer 303 provides segmentation and reassembly of data packets, and retransmission of lost data packets through ARQ. The RLC sublayer 303 also provides duplicate data packet detection and protocol error detection. The MAC sublayer 302 provides mapping between logical and transport channels and multiplexing of logical channel identities. The MAC sublayer 302 is also responsible for allocating various radio resources (e.g., resource blocks) in a cell between UEs. The MAC sublayer 302 is also responsible for HARQ (Hybrid Automatic Repeat Request) operations. The RRC (Radio Resource Control) sublayer 306 in Layer 3 (L3 layer) in the control plane 300 is responsible for obtaining radio resources (i.e., radio bearers) and configuring the lower layers using RRC signaling between the gNB and the UE. Although not shown in the figure, a V2X layer may also be provided above the RRC sublayer 306 in the control plane 300 of the UE. The V2X layer is responsible for generating a PC5 QoS parameter group and QoS rules according to the received service data or service request, generating a PC5 QoS flow corresponding to the PC5 QoS parameter group, and sending the PC5 QoS flow identifier and the corresponding PC5 QoS parameter group to the AS (Access Stratum) layer for the AS layer to perform QoS processing on the data packets belonging to the PC5 QoS flow identifier; the V2X layer also includes a PC5-S signaling protocol (PC5-Signaling Protocol) sublayer, and the V2X layer is responsible for indicating to the AS layer whether each transmission is a PC5-S transmission or a V2X service data transmission.The wireless protocol architecture of the user plane 350 includes layer 1 (L1 layer) and layer 2 (L2 layer). The wireless protocol architecture in the user plane 350 is substantially the same as the corresponding layers and sublayers in the control plane 300 for the physical layer 351, the PDCP sublayer 354 in the L2 layer 355, the RLC sublayer 353 in the L2 layer 355, and the MAC sublayer 352 in the L2 layer 355, but the PDCP sublayer 354 also provides header compression for upper layer data packets to reduce wireless transmission overhead. The L2 layer 355 in the user plane 350 also includes a SDAP (Service Data Adaptation Protocol) sublayer 356, which is responsible for mapping between QoS (Quality of Service) flows and data radio bearers (DRBs) to support the diversity of services. The wireless protocol architecture of the UE in the user plane 350 may include, at the L2 layer, a SDAP sublayer 356, a PDCP sublayer 354, a portion of or all of the protocol sublayers of the RLC sublayer 353 and the MAC sublayer 352. Although not shown, the UE may also have several upper layers above the L2 layer 355, including a network layer (e.g., an IP layer) terminated at the P-GW on the network side and an application layer terminated at the other end of the connection (e.g., a remote UE, a server, etc.).

[0243] As an example, Figure 3 The wireless protocol architecture in is applicable to the first node in this application.

[0244] As an example, Figure 3 The wireless protocol architecture in is applicable to the second node in this application.

[0245] As an embodiment, the first RRC signaling in the present application is generated in the RRC306.

[0246] As an embodiment, the second RRC signaling in the present application is generated in the RRC306.

[0247] As an embodiment, the first message in the present application is generated in the RRC306.

[0248] As an embodiment, the first message in the present application is generated by the MAC302 or the MAC352.

[0249] As an embodiment, the first message in the present application is generated by the PHY301 or the PHY351.

[0250] As an embodiment, the first wireless signal in the present application is generated by the PHY301 or the PHY351.

[0251] As an embodiment, the first random access sequence in the present application is generated in the PHY301 or the PHY351.

[0252] As an embodiment, the first timing advance in the present application is generated in the MAC302 or the MAC352.

[0253] As an embodiment, the L2 layer 305 or 355 belongs to a higher layer.

[0254] As an embodiment, the RRC sublayer 306 in the L3 layer belongs to a higher layer.

[0255] Example 4

[0256] Embodiment 4 illustrates a hardware module schematic diagram of a communication device according to an embodiment of the present application, as shown in the attached Figure 4 shown. Figure 4 is a block diagram of a first communication device 450 and a second communication device 410 communicating with each other in an access network.

[0257] The first communication device 450 includes a controller / processor 459, a memory 460, a data source 467, a transmit processor 468, a receive processor 456, a multi-antenna transmit processor 457, a multi-antenna receive processor 458, a transmitter / receiver 454 and an antenna 452.

[0258] The second communication device 410 includes a controller / processor 475, a memory 476, a data source 477, a receive processor 470, a transmit processor 416, a multi-antenna receive processor 472, a multi-antenna transmit processor 471, a transmitter / receiver 418 and an antenna 420.

[0259] In the transmission from the second communication device 410 to the first communication device 450, at the second communication device 410, the upper layer data packets from the core network or the upper layer data packets from the data source 477 are provided to the controller / processor 475. The core network and the data source 477 represent all the protocol layers above the L2 layer. The controller / processor 475 implements the functionality of the L2 layer. In the transmission from the second communication device 410 to the first communication device 450, the controller / processor 475 provides header compression, encryption, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocation to the first communication device 450 based on various priority metrics. The controller / processor 475 is also responsible for the retransmission of lost packets and signaling to the first communication device 450. The transmit processor 416 and the multi-antenna transmit processor 471 implement various signal processing functions for the L1 layer (i.e., the physical layer). The transmit processor 416 implements coding and interleaving to facilitate forward error correction (FEC) at the second communication device 410, as well as mapping of signal constellations based on various modulation schemes (e.g., binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), M-phase shift keying (M-PSK), M-quadrature amplitude modulation (M-QAM)). The multi-antenna transmit processor 471 performs digital spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing on the coded and modulated symbols to generate one or more spatial streams. The transmit processor 416 then maps each spatial stream to a subcarrier, multiplexes it with a reference signal (e.g., a pilot) in the time domain and / or frequency domain, and then uses an inverse fast Fourier transform (IFFT) to generate a physical channel carrying a time-domain multi-carrier symbol stream. The multi-antenna transmit processor 471 then performs a transmit analog precoding / beamforming operation on the time-domain multi-carrier symbol stream. Each transmitter 418 converts the baseband multi-carrier symbol stream provided by the multi-antenna transmit processor 471 into a radio frequency stream, and then provides it to a different antenna 420.

[0260] In the transmission from the second communication device 410 to the first communication device 450, at the first communication device 450, each receiver 454 receives a signal through its corresponding antenna 452. Each receiver 454 recovers the information modulated onto the RF carrier and converts the RF stream into a baseband multi-carrier symbol stream and provides it to the receiving processor 456. The receiving processor 456 and the multi-antenna receiving processor 458 implement various signal processing functions of the L1 layer. The multi-antenna receiving processor 458 performs a receiving analog precoding / beamforming operation on the baseband multi-carrier symbol stream from the receiver 454. The receiving processor 456 uses a fast Fourier transform (FFT) to convert the baseband multi-carrier symbol stream after the receiving analog precoding / beamforming operation from the time domain to the frequency domain. In the frequency domain, the physical layer data signal and the reference signal are demultiplexed by the receiving processor 456, wherein the reference signal will be used for channel estimation, and the data signal is recovered after multi-antenna detection in the multi-antenna receiving processor 458 to any spatial stream destined for the first communication device 450. The symbols on each spatial stream are demodulated and recovered in the receiving processor 456, and soft decisions are generated. The receiving processor 456 then decodes and deinterleaves the soft decisions to recover the upper layer data and control signals transmitted by the second communication device 410 on the physical channel. The upper layer data and control signals are then provided to the controller / processor 459. The controller / processor 459 implements the functions of the L2 layer. The controller / processor 459 may be associated with a memory 460 that stores program codes and data. The memory 460 may be referred to as a computer-readable medium. In the transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 provides multiplexing between transport and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover the upper layer data packets from the second communication device 410. The upper layer data packets are then provided to all protocol layers above the L2 layer. Various control signals may also be provided to the L3 for L3 processing.

[0261] In the transmission from the first communication device 450 to the second communication device 410, at the first communication device 450, the upper layer data packets are provided to the controller / processor 459 using the data source 467. The data source 467 represents all the protocol layers above the L2 layer. Similar to the transmission function at the second communication device 410 described in the transmission from the second communication device 410 to the first communication device 450, the controller / processor 459 implements header compression, encryption, packet segmentation and reordering, and multiplexing between logical and transport channels, and implements L2 layer functions for user plane and control plane. The controller / processor 459 is also responsible for the retransmission of lost packets and signaling to the second communication device 410. The transmit processor 468 performs modulation mapping and channel coding processing, and the multi-antenna transmit processor 457 performs digital multi-antenna spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing. Then, the transmit processor 468 modulates the generated spatial stream into a multi-carrier / single-carrier symbol stream, which is then provided to different antennas 452 via the transmitter 454 after analog precoding / beamforming operations in the multi-antenna transmit processor 457. Each transmitter 454 first converts the baseband symbol stream provided by the multi-antenna transmit processor 457 into a radio frequency symbol stream, and then provides it to the antenna 452.

[0262] In the transmission from the first communication device 450 to the second communication device 410, the functions at the second communication device 410 are similar to the reception functions at the first communication device 450 described in the transmission from the second communication device 410 to the first communication device 450. Each receiver 418 receives a radio frequency signal through its corresponding antenna 420, converts the received radio frequency signal into a baseband signal, and provides the baseband signal to the multi-antenna reception processor 472 and the reception processor 470. The reception processor 470 and the multi-antenna reception processor 472 jointly implement the functions of the L1 layer. The controller / processor 475 implements the L2 layer functions. The controller / processor 475 can be associated with a memory 476 that stores program codes and data. The memory 476 can be referred to as a computer-readable medium. In the transmission from the first communication device 450 to the second communication device 410, the controller / processor 475 provides multiplexing between transport and logical channels, packet reassembly, decryption, header decompression, control signal processing to recover the upper layer data packets from the first communication device 450. The upper layer data packets from the controller / processor 475 may be provided to the core network or all protocol layers above the L2 layer, and various control signals may also be provided to the core network or L3 for L3 processing.

[0263] As an embodiment, the first communication device 450 apparatus includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used together with the at least one processor, and the first communication device 450 apparatus at least: receives a first RRC signaling, the first RRC signaling indicates at least one candidate cell and at least one corresponding candidate configuration; evaluates whether a first set of conditions for a second cell is satisfied, the second cell being one of the at least one candidate cell; performs a first action; wherein the first action depends on the first set of conditions for the second cell being satisfied and a first timer; when the first timer is not running, the first action is to apply the candidate configuration for the second cell; the first set of conditions includes that the channel quality of the first cell is worse than a first threshold, the first cell is a service cell of the first node; the first timer is for the first cell and the second cell pair.

[0264] As an embodiment, the first communication device 450 apparatus includes: a memory storing a computer-readable instruction program, wherein the computer-readable instruction program generates an action when executed by at least one processor, and the action includes: receiving a first RRC signaling, wherein the first RRC signaling indicates at least one candidate cell and at least one corresponding candidate configuration; evaluating whether a first set of conditions for a second cell is satisfied, wherein the second cell is one of the at least one candidate cell; performing a first action; wherein the first action depends on the satisfaction of the first set of conditions for the second cell and a first timer; when the first timer is not running, the first action is to apply the candidate configuration for the second cell; the first set of conditions includes that the channel quality of the first cell is worse than a first threshold, and the first cell is a service cell of the first node; the first timer is for the first cell and the second cell pair.

[0265] As an embodiment, the second communication device 410 device includes: at least one processor and at least one memory, the at least one memory including computer program code; the at least one memory and the computer program code are configured to be used with the at least one processor. The second communication device 410 device at least: sends a first RRC signaling, the first RRC signaling indicates at least one candidate cell and the corresponding at least one candidate configuration; wherein whether a first condition set for a second cell is satisfied is evaluated, and the second cell is one of the at least one candidate cell; a first action is performed; the first action depends on the first condition set for the second cell being satisfied and a first timer; when the first timer is not running, the first action is to apply the candidate configuration for the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is a serving cell of the first node; the first timer is for the first cell and the second cell pair.

[0266] As an embodiment, the second communication device 410 apparatus includes: a memory storing a computer-readable instruction program, wherein the computer-readable instruction program generates an action when executed by at least one processor, the action including: sending a first RRC signaling, the first RRC signaling indicating at least one candidate cell and corresponding at least one candidate configuration; wherein whether a first condition set for a second cell is satisfied is evaluated, and the second cell is one of the at least one candidate cell; a first action is executed; the first action depends on the first condition set for the second cell being satisfied and a first timer; when the first timer is not running, the first action is to apply the candidate configuration for the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is a service cell of the first node; the first timer is for the first cell and the second cell pair.

[0267] As an embodiment, the first communication device 450 corresponds to the first node in this application.

[0268] As an embodiment, the second communication device 410 corresponds to the second node in this application.

[0269] As an embodiment, the first communication device 450 is a UE.

[0270] As an embodiment, the first communication device 450 is a relay.

[0271] As an embodiment, the second communication device 410 is a base station device.

[0272] As an embodiment, the second communication device 410 is a distribution unit of a base station.

[0273] As an embodiment, the second communication device 410 is a piece of code in a distributed unit of a base station.

[0274] As an embodiment, at least one of the antenna 420, the transmitter 418, the multi-antenna transmit processor 471, the transmit processor 416 or the controller / processor 475 is used to send the first RRC signaling in the present application.

[0275] As an embodiment, at least one of the antenna 452, the receiver 454, the multi-antenna reception processor 458, the reception processor 456 or the controller / processor 459 is used to receive the first RRC signaling in the present application.

[0276] As an embodiment, at least one of the antenna 452, the transmitter 454, the multi-antenna transmit processor 457, the transmit processor 468 or the controller / processor 459 is used to send the second RRC signaling in the present application.

[0277] As an embodiment, at least one of the antenna 420, the receiver 418, the multi-antenna reception processor 472, the reception processor 470 or the controller / processor 475 is used to receive the second RRC signaling in the present application.

[0278] As an embodiment, at least one of the antenna 452, the transmitter 454, the multi-antenna transmit processor 457, the transmit processor 468 or the controller / processor 459 is used to send the first message in the present application.

[0279] As an embodiment, at least one of the antenna 420, the receiver 418, the multi-antenna reception processor 472, the reception processor 470 or the controller / processor 475 is used to receive the first message in the present application.

[0280] As an embodiment, at least one of the antenna 452, the transmitter 454, the multi-antenna transmit processor 457, the transmit processor 468 or the controller / processor 459 is used to send the first wireless signal in the present application.

[0281] As an embodiment, at least one of the antenna 420, the receiver 418, the multi-antenna receiving processor 472, the receiving processor 470 or the controller / processor 475 is used to receive the first wireless signal in the present application.

[0282] As an embodiment, at least one of the antenna 452, the transmitter 454, the multi-antenna transmit processor 457, the transmit processor 468 or the controller / processor 459 is used to send the first random access sequence in the present application.

[0283] As an embodiment, at least one of the antenna 420, the receiver 418, the multi-antenna reception processor 472, the reception processor 470 or the controller / processor 475 is used to receive the first random access sequence in the present application.

[0284] As an embodiment, at least one of the antenna 420, the transmitter 418, the multi-antenna transmit processor 471, the transmit processor 416 or the controller / processor 475 is used to send the first timing advance in the present application.

[0285] As an embodiment, at least one of the antenna 452, the receiver 454, the multi-antenna reception processor 458, the reception processor 456 or the controller / processor 459 is used to receive the first timing advance in the present application.

[0286] Example 5

[0287] Embodiment 5 illustrates a wireless signal transmission flow chart according to an embodiment of the present application, as shown in the attached Figure 5 As shown in the attached Figure 5 In the example, the first node N51 and the first transceiver N52 communicate through the first cell, and the first node N51 and the second transceiver N53 communicate through the second cell. It is particularly noted that the order in this example does not limit the signal transmission order and implementation order in this application. The steps in the dotted boxes F51 and F52 are optional.

[0288] for First node N51 , receiving a first RRC signaling in step S511; evaluating whether a first condition set for a second cell is satisfied in step S512; sending a first random access sequence in the second cell in step S513; monitoring a first timing advance in the first cell or in the second cell in step S514. It should be noted that the implementation of step S512 is a continuous process, which may occur before or after other steps after step S511.

[0289] for The first transceiver N52 , in step S521, a first RRC signaling is sent; in step S522, a first timing advance is sent on the first cell.

[0290] for Second transceiver N53, in step S531, a first random access sequence is received on the second cell; in step S532, a first timing advance is sent on the second cell.

[0291] In embodiment 5, a first RRC signaling is received, wherein the first RRC signaling indicates at least one candidate cell and at least one corresponding candidate configuration; whether a first condition set for a second cell is met is evaluated, wherein the second cell is one of the at least one candidate cell; the first condition set includes that a channel quality of the first cell is worse than a first threshold, and the first cell is a service cell of the first node; the first timer is for the first cell and the second cell pair; as a response to receiving the first RRC signaling, a first random access sequence is sent on the second cell; a first timing advance is monitored on the first cell, or on the second cell, wherein the first timing advance is for the first random access sequence; when the first condition set is not met, the first timing advance is monitored on the first cell; when the first condition set is met and the first timer is not running, the first timing advance is monitored on the second cell.

[0292] As an embodiment, the first node N51 communicates with the first transceiver N52 through the first cell.

[0293] As an embodiment, the first node N51 communicates with the second transceiver N53 through the second cell.

[0294] As an embodiment, the first transceiver N52 and the second transceiver N53 belong to the same gNB-DU (Distributed Unit).

[0295] As an embodiment, the first transceiver N52 and the second transceiver N53 belong to two different gNB-DUs respectively, and the two different gNB-DUs are associated with the same gNB-CU (Central Unit).

[0296] As an embodiment, the first transceiver N52 and the second transceiver N53 belong to two different gNB-DUs respectively, and the two different gNB-DUs are associated with two different gNB-CUs.

[0297] As an embodiment, the first transceiver N52 and the second transceiver N53 belong to the same base station.

[0298] As an embodiment, the first transceiver N52 and the second transceiver N53 belong to different base stations.

[0299] As an embodiment, a base station includes a gNB-CU and at least one gNB-DU associated with the gNB-CU, and the gNB-CU is connected to any gNB-DU of the at least one gNB-DU through an F1 interface.

[0300] As an embodiment, the first transceiver N52 belongs to the base station of the first cell; the second transceiver N53 belongs to the base station of the second cell.

[0301] As an embodiment, the base station of the first cell and the base station of the second cell are the same base station.

[0302] As an embodiment, the base station of the first cell and the base station of the second cell are different base stations.

[0303] For ease of description, Embodiment 5 illustrates a scenario in which the first RRC signaling is received from the first cell, but the present invention is also applicable to a scenario in which the first RRC signaling is received from a serving cell other than the first cell.

[0304] As an embodiment, in response to receiving the first RRC signaling, a first random access sequence is sent on the second cell.

[0305] The above embodiment is applicable to the conditional LTM of RACH (Random Access CHannel)-Less (no random access channel).

[0306] The above embodiments can effectively reduce the cell switching delay.

[0307] As an embodiment, the first RRC signaling indicates the air interface resources for sending the first random access sequence on the second cell.

[0308] As an embodiment, the air interface resources include UL (Uplink) / SUL (Supplementary UpLink) indication.

[0309] As an embodiment, the air interface resources include SS (Synchronization Signals) / PBCH (Physical Broadcast Channel) indexes.

[0310] As an embodiment, the air interface resources include a PRACH (Physical Random Access CHannel) mask index.

[0311] As an embodiment, the air interface resources include an index of the first random access sequence.

[0312] As an embodiment, the index of the first random access sequence uniquely identifies the first random access sequence.

[0313] As an embodiment, the random access sequence in the present application means a random access preamble.

[0314] As an embodiment, the first random access sequence is a signature sequence.

[0315] As an embodiment, the first random access sequence is a Gold sequence.

[0316] As an embodiment, the first random access sequence is an M sequence.

[0317] As an embodiment, the first random access sequence is a ZC (Zadoff–Chu) sequence.

[0318] As an embodiment, the first random access sequence is dedicated to the first node.

[0319] As an embodiment, the first random access sequence is configured by the base station of the second cell, and then forwarded to the base station of the first cell and sent to the first node through the first cell.

[0320] As an embodiment, the first random access sequence is sent in a random access opportunity, and the timing of sending the first random access sequence may be earlier than, equal to, or later than the time for starting to evaluate whether the first condition set for the second cell is met.

[0321] As an embodiment, when the first condition set is met and the first timer is not running, the candidate configuration for the second cell is applied and the first random access sequence is sent on the second cell.

[0322] As a sub-embodiment of the above embodiment, the first timing advance is monitored on the second cell.

[0323] The above embodiments are applicable to RACH-based conditional LTM.

[0324] The above embodiments can reduce unnecessary random access processes and reduce UE complexity.

[0325] As an embodiment, after sending the first random access sequence, a first timing advance is monitored in the first cell or in the second cell.

[0326] As an embodiment, the first timing advance is for the first random access sequence.

[0327] As an embodiment, the first timing advance for the first random access sequence includes: the first random access sequence is used to determine the first timing advance.

[0328] As an embodiment, the first timing advance for the first random access sequence includes: reception of the first random access sequence is used to trigger sending of the first timing advance.

[0329] As an embodiment, the first timing advance for the first random access sequence includes: sending the first timing advance is a response to receiving the first random access sequence.

[0330] As an embodiment, the first timing advance for the first random access sequence includes: sending of the first timing advance must be caused by sending of the first random access sequence.

[0331] As an embodiment, the first timing advance is used to determine the uplink timing of the second cell.

[0332] As an embodiment, the first timing advance is applied to a TAG (timing advance group) to which the second cell belongs.

[0333] As an embodiment, after receiving the first random access sequence from the second cell, the base station of the second cell can obtain the first timing advance of the sender of the first random access sequence, and the first timing advance is used by the sender of the first random access sequence for uplink timing when performing uplink transmission on the second cell.

[0334] As an embodiment, monitoring the first timing advance on a cell includes monitoring a PDCCH (Physical Downlink Control CHannel) for the first timing advance on the cell, and the first timing advance is carried in a PDSCH (Physical Downlink Shared CHannel) scheduled by the PDCCH.

[0335] As an embodiment, the monitoring means including searching.

[0336] As an embodiment, the monitoring means including blind decoding of PDCCH, and judging whether the decoding is correct according to CRC (Cyclic Redundancy Check).

[0337] As an embodiment, monitoring the first timing advance on a cell includes receiving a PDSCH on a time-frequency resource preconfigured in the cell, the PDSCH carrying the first timing advance.

[0338] As a sub-embodiment of the above embodiment, the monitoring means including decoding the PDSCH and judging whether the decoding is correct according to a CRC (Cyclic Redundancy Check).

[0339] The sending or receiving of PDSCH in the present application includes: sending or receiving a wireless signal through PDSCH; it is also applicable to other physical channels, including but not limited to PDCCH, PUSCH (Physical Uplink Shared Channel), PUCCH (Physical Uplink Control Channel), and PRACH.

[0340] Decoding PDSCH in the present application includes: decoding a wireless signal received through PDSCH; it is also applicable to other physical channels, including but not limited to PDCCH, PUCCH, and PUSCH.

[0341] Example 6

[0342] Embodiment 6 illustrates a flowchart of monitoring the first timing advance in the first cell or the second cell according to an embodiment of the present application, as shown in the attached Figure 6 As shown in the attached Figure 6 In step S601, start evaluating the first condition set for the second cell; in step S602, determine whether the first condition set is met; if yes, execute step S603, if not, execute step S604; in step S604, listen to the first timing advance on the first cell; in step S603, determine whether the first timer is running; if yes, execute step S604, if not, execute step S605.

[0343] It should be noted that after determining that the first condition set for the second cell is not met, the first condition set is continuously evaluated whether it is met, that is, evaluating whether the first condition set is met and monitoring the first timing advance on the first cell are implemented simultaneously.

[0344] It should be noted that after determining that the first timer is running, it is continued to determine whether the first timer has expired, that is, determining whether the first timer has expired and monitoring the first timing advance on the first cell are implemented simultaneously.

[0345] Embodiment 6 is applicable when the first timing advance is not received on the first cell before the first condition set is met.

[0346] As an embodiment, whether to monitor the first timing advance on the first cell or the second cell depends on whether the first condition set is satisfied and whether the first timer is running.

[0347] As an embodiment, when the first condition set is not met, the first timing advance is not monitored on the second cell.

[0348] As an embodiment, when the first condition set is not met, the first timing advance is monitored on the first cell regardless of whether the first timer is running.

[0349] As an embodiment, when the first timing advance is sent through the first cell, the first timing advance is carried in a MAC CE (Control Element).

[0350] As an embodiment, the MAC CE is an Absolute Timing Advance Command.

[0351] As an embodiment, the MAC CE is a Timing Advance Command.

[0352] As an embodiment, the MAC CE is a LTM Cell Switch Command (cell switching command).

[0353] As an embodiment, when monitoring the first timing advance on the first cell, the CRC of the PDCCH for the first timing advance is scrambled by a C-RNTI (Cell-Radio Network Temporary Identifier), and the C-RNTI is configured by the base station of the first cell.

[0354] As an embodiment, when the base station of the first cell and the base station of the second cell are different base stations, the first timing advance is obtained at the base station of the second cell, and then forwarded to the base station of the first cell through a backhaul network (backhaul), and sent to the first node by the first transceiver N52 through the first cell.

[0355] As a sub-embodiment of the above embodiment, the above method can reduce the communication interruption time with the first cell by not receiving the first timing advance in the second cell.

[0356] As an embodiment, when the base station of the first cell and the base station of the second cell are different base stations, the first random access sequence is configured by the base station of the second cell, and then forwarded to the base station of the first cell through the backhaul network, and sent to the first node by the first transceiver N52 through the first cell.

[0357] As an embodiment, when the base station of the first cell and the base station of the second cell are different base stations, the base station of the second cell determines the base station of the serving cell of the sender of the first random access sequence according to the received first random access sequence.

[0358] As an embodiment, when the base station of the first cell and the base station of the second cell are different base stations, the candidate configuration of the second cell is configured by the base station of the second cell, and then forwarded to the base station of the first cell through the backhaul network, and sent to the first node by the first transceiver N52 through the first cell.

[0359] As an embodiment, the backhaul network is ideal.

[0360] As an embodiment, the backhaul network is non-ideal.

[0361] As an embodiment, when the first timing advance is not received before the first condition set is met, and the first condition set is met, whether to monitor the first timing advance on the second cell depends on whether the first timer is running.

[0362] As a sub-embodiment of the above embodiment, when the first timer is running, the first timing advance is not monitored on the second cell.

[0363] As a sub-embodiment of the above embodiment, when the first timer is running, the first timing advance is monitored on the first cell.

[0364] As a sub-embodiment of the above embodiment, when the first timer is not running, the first timing advance is monitored on the second cell.

[0365] As an embodiment, when the first timing advance is not received before the first condition set is met, and the first condition set is met, and the first timer is running, the first node does not monitor RAR (random access response) on the second cell.

[0366] The method in the above embodiment can reduce the communication interruption time between the first node and the serving cell, and the serving cell includes the first cell.

[0367] As an embodiment, the first timing advance is not received before the first condition set is met, and the first condition set is met, and the first timer is not running, and the random access response window (ra-ResponseWindow) is running, and RAR (random access response) is monitored on the second cell.

[0368] As a sub-embodiment of the above embodiment, the first processor, as a response to sending the first random access sequence, starts the random access response window.

[0369] As a sub-embodiment of the above embodiment, the first timing advance is carried in the RAR.

[0370] The above embodiments are backward compatible and can simplify UE implementation.

[0371] As an embodiment, when the first timing advance is not received before the first condition set is met, the first condition set is met, and the first timer is not running, the first timing advance is monitored on the pre-allocated time-frequency resources of the second cell.

[0372] As a sub-embodiment of the above embodiment, the wireless signal occupying the pre-allocated time-frequency resources is sent through a PDSCH, and the PDSCH carries the first timing advance.

[0373] As a sub-embodiment of the above embodiment, the first timing advance is carried in a MAC CE.

[0374] The above embodiment can reduce the uplink synchronization delay during the cell switching process.

[0375] As an embodiment, the pre-allocated time-frequency resources are periodic.

[0376] As an embodiment, the pre-allocated time-frequency resources appear multiple times.

[0377] As an embodiment, the first random access sequence is used to activate a first downlink allocation, and the first downlink allocation indicates the pre-allocated time-frequency resources.

[0378] As an embodiment, the second transceiver, in response to receiving the first random access sequence, activates a first downlink allocation, and the first downlink allocation indicates the pre-allocated time-frequency resources.

[0379] As a sub-embodiment of the above two embodiments, the first random access sequence is dedicated to the first node.

[0380] As a sub-embodiment of the above two embodiments, the first downlink allocation is for the first node.

[0381] The above two embodiments effectively support the activation of the first downlink allocation.

[0382] As an embodiment, the first downlink allocation is semi-persistent scheduling.

[0383] As an embodiment, the first downlink assignment is a type 1 downlink configured assignment.

[0384] As an embodiment, the first downlink allocation is a type 2 downlink configuration allocation.

[0385] As an embodiment, the first RRC signaling configures the first downlink allocation.

[0386] As an embodiment, the first RRC signaling includes configuration information of the first downlink allocation.

[0387] As an embodiment, the configuration information of the first downlink allocation is determined by the base station of the second cell, and then sent to the base station of the first cell through the backhaul network, and sent to the first node through the first cell.

[0388] As an embodiment, after receiving the first timing advance, the first downlink allocation is deactivated.

[0389] As an embodiment, after receiving the first timing advance, whether the first downlink allocation is deactivated is determined by the network.

[0390] As an embodiment, the deactivation includes releasing preconfigured time-frequency resources.

[0391] As an embodiment, the first timing advance is not received before the first condition set is met, and the first condition set is met, and the first timer is not running, and the PDCCH for the first timing advance is monitored on the second cell.

[0392] As a sub-embodiment of the above embodiment, the CRC of the PDCCH for the first timing advance is scrambled by a C-RNTI, and the C-RNTI is configured by a base station of the second cell.

[0393] As an embodiment, the first node does not monitor the first timing advance on the first cell and the second cell at the same time.

[0394] As an embodiment, the first processor, in response to receiving the first RRC signaling, sends a first random access sequence on the second cell; the first receiver monitors a first timing advance on the first cell and on the second cell, and the first timing advance is for the first random access sequence.

[0395] As an embodiment, whether the first node monitors the first timing advance on the first cell and the second cell at the same time is determined by the UE itself.

[0396] As an embodiment, whether the first node monitors the first timing advance on the first cell and the second cell simultaneously depends on UE capabilities.

[0397] As an embodiment, when the first condition set is not satisfied, the first timing advance is monitored on the first cell; whether to monitor the first timing advance on the second cell depends on the receiving capability of the first node.

[0398] The method in the above embodiment can flexibly monitor the first timing advance according to the UE receiving capability; when the UE is capable of monitoring the first timing advance on the second cell at the same time, the reliability of receiving the first timing advance can be improved.

[0399] As an embodiment, when the first condition set is met, the first timer is not running, and after the first timing advance is received, a PUSCH is sent on the second cell to indicate that the conditional LTM is completed.

[0400] As an embodiment, the PUSCH carries RRCReconfigurationComplete (RRC reconfiguration completed).

[0401] As an embodiment, the PUSCH carries a UL data.

[0402] As an embodiment, the PUSCH carries the first uplink data sent on the second cell.

[0403] As an embodiment, the first timing advance is applied to the PUSCH.

[0404] As an embodiment, the first timing advance being applied to the PUSCH includes: the advance value indicated by the first timing advance is used to send the uplink timing of the PUSCH.

[0405] As an embodiment, the first timing advance is applied to the PUSCH and includes: the first timing advance indicates an advance value of the start time of the uplink time unit for sending the PUSCH relative to the corresponding downlink time unit.

[0406] As a sub-embodiment of the above embodiment, the time unit is a frame, a subframe or a time slot.

[0407] As an embodiment, the first node obtains the downlink synchronization of the second cell according to the downlink synchronization signal; the advance value of the first timing advance indication is t; if the uplink transmission time slot of the PUSCH is n, the first node starts sending the PUSCH at a time t before the start time of the corresponding downlink time slot n.

[0408] As an embodiment, the advance value of the first timing advance indication is related to the subcarrier of the PUSCH.

[0409] As an embodiment, the advance value of the first timing advance indication is N TA =T A ·16·64 / 2 μ ; wherein the T A is the index included in the first timing advance, the 2 μ ·15 kHz (kilohertz) is the subcarrier spacing (SCS) of the second cell.

[0410] As an example, the T A A positive integer less than 4096.

[0411] As an example, the T A The value of is 0,1,2,...,3846.

[0412] As an embodiment, μ is a positive integer not greater than 10.

[0413] As an embodiment, the value of μ is 0, 1, 2, 3, 4, 5, 6.

[0414] As an embodiment, when the first condition set is met and the first timer is not running, but the first timing advance is not received, a random access process is initiated on the second cell to obtain uplink synchronization with the second cell.

[0415] As an embodiment, the first processor, after applying the candidate configuration for the second cell, starts a first set of operations; wherein the first set of operations includes at least one of monitoring PDCCH (Physical Downlink Control Channel) on the second cell, monitoring PDCCH used to schedule the second cell, and sending PRACH (Physical Random Access Channel) on the second cell.

[0416] Example 7

[0417] Embodiment 7 illustrates a flowchart of monitoring PDCCH or sending PRACH according to an embodiment of the present application, as shown in the attached Figure 7 As shown in the attached Figure 7 In the example, the first node N71 and the first transceiver N72 communicate through the first cell.

[0418] for First node N71 In step S711, it is evaluated that the first condition set for the second cell is met and the first timer is running; in step S712, the PDCCH is monitored on the first cell, or the PDCCH used to schedule the first cell is monitored, or the PRACH is sent on the first cell.

[0419] for First transceiver N72 , in step S721, a PDCCH is sent on the first cell, or a PRACH is received on the first cell.

[0420] Not shown in the figure, corresponding to the first node receiving the PDCCH for scheduling the first cell, the first transceiver sends the PDSCH, or the first transceiver receives the PUSCH, wherein the PDSCH or the PUSCH is scheduled by the PDCCH that schedules the first cell.

[0421] As an embodiment, the first transceiver N72 belongs to the base station of the first cell.

[0422] As an embodiment, the first action depends on whether the first condition set for the second cell is satisfied and a first timer includes: the first action depends on whether the first condition set for the second cell is satisfied and whether the first timer is running.

[0423] As a sub-embodiment of the above embodiment, when the first condition set for the second cell is met and the first timer is running, the first action includes at least one of monitoring PDCCH on the first cell, monitoring PDCCH used to schedule the first cell, and sending PRACH on the first cell.

[0424] As an embodiment, the first action includes at least one of monitoring PDCCH on the first cell, monitoring PDCCH used to schedule the first cell, and sending PRACH on the first cell, which means that the first action is at least one of monitoring PDCCH on the first cell, monitoring PDCCH used to schedule the first cell, and sending PRACH on the first cell.

[0425] As an embodiment, the phrase monitoring PDCCH on the first cell includes: monitoring PDCCH on air interface resources of the first cell.

[0426] As an embodiment, the phrase monitoring a PDCCH used to schedule the first cell includes: monitoring a PDCCH, wherein the PDCCH is used to schedule air interface resources of the first cell.

[0427] As an embodiment, the phrase sending PRACH on the first cell includes: sending PRACH on air interface resources of the first cell.

[0428] As an embodiment, when the first condition set for the second cell is met and the first timer is running, the first action is to continue to apply the configuration information for the first cell.

[0429] As an embodiment, when the first condition set for the second cell is met and the first timer is running, the first action includes continuing to perform uplink transmission or downlink reception on the first cell.

[0430] As an embodiment, when the first condition set for the second cell is met and the first timer is running, the first action is to abandon switching from the first cell to the second cell.

[0431] As an embodiment, when the first condition set for the second cell is met and the first timer is running, the candidate configuration for the second cell is not applied.

[0432] Example 8

[0433] Embodiment 8 illustrates a flowchart of sending a first message according to an embodiment of the present application, as shown in the attached Figure 8 As shown in the attached Figure 8 In the example, the first node N81 and the first transceiver N82 communicate through the first cell.

[0434] for First node N81 , in step S811 , it is evaluated that a first condition set for the second cell is met and a first timer is running; in step S812 , a first message is sent on the first cell.

[0435] for The first transceiver N82 , in step S821, a first message is received on the first cell.

[0436] As an embodiment, the first transceiver N82 belongs to the base station of the first cell.

[0437] As an embodiment, the first action depends on whether the first condition set for the second cell is satisfied and a first timer includes: the first action depends on whether the first condition set for the second cell is satisfied and whether the first timer is running.

[0438] As a sub-embodiment of the above embodiment, when the first condition set for the second cell is met and the first timer is running, the first action includes sending a first message.

[0439] As an embodiment, the first action includes sending a first message, which means that the first action is sending the first message.

[0440] As an embodiment, the first message is sent on the first cell in response to the first set of conditions for the second cell being met; wherein the first timer is not running.

[0441] As an embodiment, the first message is sent on the first cell in response to expiration of the first timer; wherein the first set of conditions for the second cell is met.

[0442] As an embodiment, the first message is a physical layer message.

[0443] As an embodiment, the first message is UCI (Uplink Control Information, uplink control information).

[0444] As an embodiment, the first message indicates that a ping-pong handover occurs between the first cell and the second cell.

[0445] As an embodiment, the UCI includes 1 bit.

[0446] As an embodiment, the UCI includes multiple bits, and the multiple bits indicate the second cell.

[0447] As an embodiment, the first message is a higher layer message.

[0448] As an embodiment, the higher layer message is an RRC message.

[0449] As an embodiment, the first message is UEAssistanceInformation (user equipment assistance information).

[0450] As an embodiment, the higher layer message is a measurement message.

[0451] As an embodiment, the measurement message is used to trigger the LTM.

[0452] As an embodiment, the higher layer message is MAC CE.

[0453] As an embodiment, the higher layer message is used to request a cell handover.

[0454] As an embodiment, the base station of the first cell determines to perform the second action based on the first message received.

[0455] As an embodiment, the second action is to trigger cell switching by issuing a switching command.

[0456] As an embodiment, the second action is to trigger CPC.

[0457] As an embodiment, the second action is triggering CPA.

[0458] As an embodiment, the second action is to modify the first condition set.

[0459] The above method can effectively avoid ping-pong switching.

[0460] As an embodiment, the base station of the first cell determines that the action to be performed is network-implemented based on the first message received.

[0461] Example 9

[0462] Embodiment 9 illustrates a schematic diagram of sending a first wireless signal and starting a first timer according to an embodiment of the present application, as shown in the attached figure. Fig. 9 As shown in the attached Fig. 9 In the example, the first node N91 and the first transceiver N92 communicate with each other through the first cell.

[0463] for First node N91 , in step S911, evaluating whether a second condition set for the first cell is satisfied; in step S912, applying the candidate configuration for the first cell; in step S913, sending a first wireless signal on the first cell; and in step S914, starting a first timer.

[0464] for The first transceiver N92 , in step S921, a first wireless signal is received in the first cell.

[0465] As an embodiment, the first transceiver N92 belongs to the base station of the first cell.

[0466] In Embodiment 9, the second cell is a service cell of the first node, and the first cell is a switching candidate cell of the first node.

[0467] Example 9 describes a scenario in which the first node successfully switches from the second cell to the first cell.

[0468] As an embodiment, the first cell is one of the at least one candidate cell.

[0469] As an embodiment, the first RRC signaling indicates the first cell.

[0470] As an embodiment, the first RRC signaling implicitly indicates the candidate configuration of the first cell.

[0471] As a sub-embodiment of the above embodiment, the first RRC signaling is received on the first cell.

[0472] As a sub-embodiment of the above embodiment, the first cell is a service cell of the first node.

[0473] As an embodiment, the first RRC signaling explicitly indicates the candidate configuration of the first cell.

[0474] As a sub-embodiment of the above embodiment, the first cell is not a serving cell of the first node.

[0475] As an embodiment, it is evaluated whether a second set of conditions for the first cell is met.

[0476] As an embodiment, the second set of conditions for the first cell is network configured.

[0477] As an embodiment, the second condition set includes at least one condition.

[0478] As an embodiment, the second condition set includes conditions for executing conditional LTM.

[0479] As an embodiment, the second condition set includes an event for executing the conditional LTM.

[0480] As an embodiment, the second condition set includes conditions for executing CHO.

[0481] As an embodiment, the second condition set includes that the channel quality of the first cell is worse than a second threshold.

[0482] As an embodiment, the second threshold is a measured value.

[0483] As an embodiment, the second threshold is a configuration value.

[0484] As an embodiment, the second threshold is a value obtained by linearly processing the measurement value and the offset value, and the offset value is configurable.

[0485] Specifically, the process of evaluating whether the second condition set for the first cell is satisfied is the same as the process of evaluating whether the first condition set for the second cell is satisfied, which is not repeated here.

[0486] As an embodiment, in response to the second set of conditions for the first cell being met, the candidate configuration for the first cell is applied.

[0487] As a sub-embodiment of the above embodiment, the first timer is not running.

[0488] As a sub-embodiment of the above embodiment, the first node triggers the condition LTM for the first time after entering the RRC connection state.

[0489] As a sub-embodiment of the above embodiment, the first node switches from a cell other than the first cell to the second cell; when the second cell is a serving cell of the first node, it is evaluated whether the second condition set for the first cell is satisfied.

[0490] As an embodiment, after applying the candidate configuration for the first cell and before applying the candidate configuration for the second cell, the first node does not apply the candidate configuration for the third cell; wherein the third cell is any cell of the at least one candidate cell except the first cell and the second cell.

[0491] As an embodiment, after applying the candidate configuration for the first cell, a first wireless signal is sent on the first cell.

[0492] As an embodiment, the first wireless signal is the first wireless signal sent through PUSCH on the first cell.

[0493] As an embodiment, the air interface resources occupied by the first wireless signal are preconfigured.

[0494] As an embodiment, the air interface resources occupied by the first wireless signal belong to an uplink configured grant (uplink configured grant).

[0495] As an embodiment, the first receiver receives a PDCCH that schedules the first cell, and the PDCCH indicates air interface resources occupied by the first wireless signal.

[0496] As an embodiment, the air interface resources include at least one of time domain resources, frequency domain resources, code domain resources or space domain resources.

[0497] As an embodiment, the first wireless signal carries second RRC signaling.

[0498] As an embodiment, the second RRC signaling is RRCReconfigurationComplete (RRC reconfiguration completed).

[0499] As an embodiment, the second RRC signaling is a response to the first RRC signaling.

[0500] As an embodiment, the second RRC signaling indicates that the conditional LTM to the first cell is successfully completed.

[0501] As an embodiment, after the second RRC signaling is successfully sent, it starts to evaluate whether the first condition set for the second cell is met.

[0502] The above method can support subsequent conditional LTM.

[0503] As an embodiment, the first timer is started as a response to the successful sending of the second RRC signaling.

[0504] As an embodiment, starting the first timer includes setting the value of the first timer to 0.

[0505] As an embodiment, starting the first timer includes setting the value of the first timer to the expiration value of the first timer.

[0506] As an embodiment, the first timer indicates the shortest time interval required to switch from the first cell back to the second cell again.

[0507] As an embodiment, after sending the first wireless signal, PDCCH is received on the service cell of the first node, and the second RRC signaling is successfully sent.

[0508] As an embodiment, after sending the first wireless signal, a PDCCH is received on a service cell of the first node, the PDCCH indicates a downlink assignment and the PDCCH indicates a new transmission, and the second RRC signaling is successfully sent.

[0509] As an embodiment, after sending the first wireless signal, a PDCCH is received on the service cell of the first node, the PDCCH indicates an uplink grant, and the PDCCH indicates a new transmission, and the HARQ process of the new transmission is the same as the HARQ (Hybrid Automatic Repeat Request) process used for the first wireless signal, and the second RRC signaling is successfully sent.

[0510] As a sub-embodiment of the above three embodiments, the PDCCH is scrambled by a C-RNTI, and the C-RNTI is allocated to the first node by a base station of the first cell.

[0511] As an embodiment, starting the first timer includes: when the first timer is running, restarting the first timer.

[0512] As an embodiment, when a cell switching command is received, the first timer is stopped.

[0513] As an embodiment, when a cell switching command is received, the first timer is restarted.

[0514] The above embodiments effectively support a mix of network-triggered LTM and UE-triggered LTM.

[0515] As a sub-embodiment of the above two embodiments, the cell switching command indicates switching to the second cell.

[0516] As an embodiment, when a cell switching command is received, switching to the second cell is performed regardless of whether the first timer is running.

[0517] As an embodiment, when a cell switching command is received, switching to the second cell is performed and the first timer is restarted.

[0518] The above embodiments effectively support a mix of network-triggered LTM and UE-triggered LTM.

[0519] As an embodiment, the cell switching command is RRCReconfiguration (RRC reconfiguration) including ReconfigurationWithSync (synchronous reconfiguration).

[0520] As an embodiment, the cell switching command is LTM Cell Switch Command (LTM cell switching command) MAC CE.

[0521] As an embodiment, the cell switching command is received before the first condition set for the second cell is met.

[0522] As an embodiment, the cell switching command is received when the first condition set for the second cell is met and the first timer is running.

[0523] As an embodiment, when the at least one candidate cell and the corresponding at least one candidate configuration are released, the first timer is stopped.

[0524] As an embodiment, when the candidate configuration of the second cell is released, the first timer is stopped.

[0525] As a sub-embodiment of the above two embodiments, stopping the first timer includes: clearing the first timer.

[0526] Example 10

[0527] Embodiment 10 illustrates a schematic diagram of the relationship between cell switching and the first timer according to an embodiment of the present application, as shown in the attached figure. Fig.10 Attached Fig.10 In step S1001, switching from the second cell to the first cell starts a first timer; in step S1002, when the first condition set for the second cell is met and the first timer is not running, switching to the second cell.

[0528] As an embodiment, the first timer starts after the first node switches from the second cell to the first cell; the first timer indicates the shortest time interval required for the first node to switch from the first cell back to the second cell; when the first timer is running, even if the first condition set for the second cell, that is, the condition set for condition LTM back to the second cell, is met, the first node cannot switch back to the second cell; only when the first timer is not running and the first condition set for the second cell is met, can the first node switch back to the second cell.

[0529] The above embodiment can effectively avoid frequent ping-pong switching of the first node between the first cell and the second cell.

[0530] As an embodiment, after the first node switches from the second cell condition to the first cell, the first timer is started; the first timer indicates the shortest time length required for the first node to switch from the first cell back to the second cell; if the first node switches from the first cell to the third cell, the first timer is restarted, and the first timer indicates the shortest time length required for the first node to switch from the third cell back to the first cell.

[0531] As a sub-embodiment of the above embodiment, the first timer targets any two cells among the at least one candidate cell configured by the first RRC signaling; wherein the at least one candidate cell includes at least two cells.

[0532] In the above embodiment, the first node only needs to maintain one first timer, which can reduce the complexity of UE implementation.

[0533] As an embodiment, the first cell, the second cell and the third cell are any three cells included in the at least one candidate cell; wherein the at least one candidate cell includes at least three cells.

[0534] As an embodiment, the first timer is for a pair of the first cell and the second cell, wherein the first cell and the second cell are a source cell and a target cell when a most recent handover occurs.

[0535] As an embodiment, the first timer is for a pair of the first cell and the second cell, wherein the first cell and the second cell are any two candidate cells among the at least one candidate cell; wherein the at least one candidate cell includes at least two cells.

[0536] As a sub-embodiment of the above embodiment, when the source cell when the first node most recently switched is the first cell, and the target cell is the second cell, that is, switching from the first cell to the second cell, the first timer indicates the shortest time length required for the first node to switch from the second cell back to the first cell; when the source cell when the first node most recently switched is the second cell, and the target cell is the first cell, that is, switching from the second cell to the first cell, the first timer indicates the shortest time length required for the first node to switch from the first cell back to the second cell.

[0537] Embodiment 11

[0538] Embodiment 11 illustrates a structural block diagram of a processing device in a first node according to an embodiment of the present application, as shown in the attached figure. Fig.11 As shown in the attached Fig.11 In the embodiment, the first node processing device 11 comprises a first receiver 1101 and a first processor 1102; the first node 1100 is a UE.

[0539] In embodiment 11, a first receiver 1101 receives a first RRC signaling, wherein the first RRC signaling indicates at least one candidate cell and at least one corresponding candidate configuration; a first processor 1102 evaluates whether a first set of conditions for a second cell is met, wherein the second cell is one of the at least one candidate cell; and performs a first action; wherein the first action depends on the first set of conditions for the second cell being met and a first timer; when the first timer is not running, the first action is to apply the candidate configuration for the second cell; the first set of conditions includes that the channel quality of the first cell is worse than a first threshold, and the first cell is a service cell of the first node; and the first timer is for the first cell and the second cell pair.

[0540] As an embodiment, when the first timer is running, the first action includes at least one of monitoring PDCCH on the first cell, monitoring PDCCH used for scheduling the first cell, and sending PRACH on the first cell.

[0541] As an embodiment, when the first timer is running, the first action includes sending a first message on the first cell.

[0542] As an embodiment, the first processor 1102 evaluates whether a second set of conditions for the first cell is met; in response to the second set of conditions for the first cell being met, applies the candidate configuration for the first cell and sends a first wireless signal on the first cell, wherein the first wireless signal carries a second RRC signaling; in response to the successful sending of the second RRC signaling, starts the first timer; wherein the second set of conditions includes that the channel quality of the first cell is worse than a second threshold, the second cell is a service cell of the first node; and the first cell is a cell of the at least one candidate cell other than the second cell.

[0543] As an embodiment, the first processor 1102 stops the first timer when the at least one candidate cell and the corresponding at least one candidate configuration are released, or when a cell switching command is received.

[0544] As an embodiment, the first processor 1102, in response to receiving the first RRC signaling, sends a first random access sequence on the second cell; the first receiver 1101, in the first cell, or, in the second cell, monitors a first timing advance, wherein the first timing advance is for the first random access sequence.

[0545] As an embodiment, the first processor 1102, in response to receiving the first RRC signaling, sends a first random access sequence on the second cell; the first receiver 1101, in the first cell, or, in the second cell, monitors a first timing advance, the first timing advance being for the first random access sequence; when the first condition set is not met, monitors the first timing advance on the first cell; when the first timing advance is not received before the first condition set is met, and the first condition set is met, and the first timer is not running, monitors the first timing advance on the second cell.

[0546] As an embodiment, the first receiver 1101 includes the attached Figure 4 The receiver 454 (including antenna 452), receive processor 456, multi-antenna receive processor 458 and controller / processor 459.

[0547] As an embodiment, the first receiver 1101 includes the attached Figure 4 At least one of the receiver 454 (including antenna 452), receive processor 456, multi-antenna receive processor 458 or controller / processor 459.

[0548] As an embodiment, the first processor 1102 includes the Figure 4 The transmitter 454 (including antenna 452), transmit processor 468, multi-antenna transmit processor 457 and controller / processor 459.

[0549] As an embodiment, the first processor 1102 includes the Figure 4 At least one of the receiver 454 (including antenna 452), transmit processor 468, multi-antenna transmit processor 457 or controller / processor 459.

[0550] As an embodiment, the first processor 1102 includes the Figure 4 Middle controller / processor 459.

[0551] Example 12

[0552] Embodiment 12 illustrates a structural block diagram of a processing device in a second node according to an embodiment of the present application, as shown in the attached figure. Fig.12 As shown in the attached Fig.12 In the figure, the dotted box indicates that it is optional, the second node processing device 1200 includes a first transceiver 1201, or the second node processing device 1200 includes a first transceiver 1201 and a second transceiver 1202; the second node 1200 is a base station.

[0553] In embodiment 12, the first transceiver 1201 sends a first RRC signaling, wherein the first RRC signaling indicates at least one candidate cell and at least one corresponding candidate configuration; wherein, whether a first condition set for a second cell is satisfied is evaluated, and the second cell is one of the at least one candidate cell; a first action is performed; the first action depends on the first condition set for the second cell being satisfied and a first timer; when the first timer is not running, the first action is to apply the candidate configuration for the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is a service cell of the first node; the first timer is for the first cell and the second cell pair.

[0554] As an embodiment, when the first timer is running, the first action includes at least one of monitoring PDCCH on the first cell, monitoring PDCCH used for scheduling the first cell, and sending PRACH on the first cell.

[0555] As an embodiment, when the first timer is running, the first action includes sending a first message on the first cell.

[0556] As an embodiment, the first transceiver 1201 receives a first wireless signal on the first cell, and the first wireless signal carries a second RRC signaling; wherein, whether a second condition set for the first cell is met is evaluated; as a response to the second condition set for the first cell being met, the candidate configuration for the first cell is applied; as a response to the second RRC signaling being successfully sent, the first timer is started; the second condition set includes that the channel quality of the first cell is worse than a second threshold, the second cell is a service cell of the first node; the first cell is one of the at least one candidate cell.

[0557] As an embodiment, when the at least one candidate cell and the corresponding at least one candidate configuration are released, the first timer is stopped.

[0558] As an embodiment, when the at least one candidate cell and the corresponding at least one candidate configuration are released, the first timer is cleared.

[0559] As an embodiment, when a cell switching command is received, the first timer is stopped.

[0560] As an embodiment, the second transceiver 1202 receives a first random access sequence on the second cell, and the first random access sequence is triggered by the first RRC signaling; the first transceiver 1201 sends a first timing advance on the first cell; or, the second transceiver 1202 sends the first timing advance on the second cell, and the first timing advance is for the first random access sequence.

[0561] As an embodiment, the first transceiver 1201 sends a first timing advance on the first cell, wherein the first timing advance is for a first random access sequence; wherein the first random access sequence is sent on the second cell as a response to the first RRC signaling being received.

[0562] As an embodiment, the second transceiver 1202 receives a first random access sequence on the second cell, and the first random access sequence is triggered by the first RRC signaling; the first transceiver 1201 sends a first timing advance on the first cell; or, the second transceiver 1202 sends the first timing advance on the second cell, and the first timing advance is for the first random access sequence; when the first condition set is not met, the first timing advance is monitored on the first cell; when the first timing advance is not received before the first condition set is met, and the first condition set is met, and the first timer is not running, the first timing advance is monitored on the second cell.

[0563] As an embodiment, the first transceiver 1201 includes the attached Figure 4 The transmitter 418 (including antenna 420), transmit processor 416, multi-antenna transmit processor 471 and controller / processor 475.

[0564] As an embodiment, the first transceiver 1201 includes the attached Figure 4 At least one of the transmitter 418 (including antenna 420), the transmit processor 416, the multi-antenna transmit processor 471 or the controller / processor 475.

[0565] As an embodiment, the first transceiver 1201 includes the attached Figure 4 The receiver 418 (including antenna 420), receive processor 470, multi-antenna receive processor 472 and controller / processor 475.

[0566] As an embodiment, the first transceiver 1201 includes the attached Figure 4 At least one of the receiver 418 (including the antenna 420), the receive processor 470, the multi-antenna receive processor 472 or the controller / processor 475.

[0567] As an embodiment, the second transceiver 1202 includes Figure 4 The transmitter 418 (including antenna 420), transmit processor 416, multi-antenna transmit processor 471 and controller / processor 475.

[0568] As an embodiment, the second transceiver 1202 includes Figure 4 At least one of the transmitter 418 (including antenna 420), the transmit processor 416, the multi-antenna transmit processor 471 or the controller / processor 475.

[0569] As an embodiment, the second transceiver 1202 includes Figure 4 The receiver 418 (including antenna 420), receive processor 470, multi-antenna receive processor 472 and controller / processor 475.

[0570] As an embodiment, the second transceiver 1202 includes Figure 4 At least one of the receiver 418 (including the antenna 420), the receive processor 470, the multi-antenna receive processor 472 or the controller / processor 475.

[0571] A person of ordinary skill in the art can understand that all or part of the steps in the above method can be completed by instructing the relevant hardware through a program, and the program can be stored in a computer-readable storage medium, such as a read-only memory, a hard disk or an optical disk. Optionally, all or part of the steps in the above embodiment can also be implemented using one or more integrated circuits. Accordingly, each module unit in the above embodiment can be implemented in the form of hardware or in the form of a software function module, and the present application is not limited to any specific form of software and hardware combination. The first type of communication node or UE or terminal in the present application includes but is not limited to mobile phones, tablet computers, notebooks, Internet cards, low-power devices, eMTC (enhanced Machine Type Communication, enhanced machine type communication) equipment, NB-IoT equipment, vehicle-mounted communication equipment, aircraft, airplanes, drones, remote-controlled aircraft and other wireless communication equipment. The second type of communication node or base station or network side equipment in the present application includes but is not limited to macrocellular base stations, microcellular base stations, home base stations, relay base stations, eNB, gNB, transmission and reception nodes TRP (Transmission and Reception Point, transmission and reception point), relay satellites, satellite base stations, aerial base stations and other wireless communication equipment.

[0572] The above is only a preferred embodiment of the present application and is not intended to limit the protection scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A first node used for wireless communication, characterized in that: include: A first receiver receives a first RRC signaling, where the first RRC signaling indicates at least one candidate cell and at least one corresponding candidate configuration; A first processor is configured to evaluate whether a first condition set for a second cell is satisfied, wherein the second cell is one of the at least one candidate cell; and perform a first action; The first action depends on the first set of conditions for the second cell being satisfied and a first timer; When the first timer is not running, the first action is to apply the candidate configuration for the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is a serving cell of the first node; the first timer is for the first cell and the second cell pair.

2. The first node according to claim 1, characterized in that: When the first timer is running, the first action includes at least one of monitoring a PDCCH on the first cell, monitoring a PDCCH for scheduling the first cell, and sending a PRACH on the first cell.

3. The first node according to claim 1 or 2, characterized in that: While the first timer is running, the first action includes sending a first message on the first cell.

4. The first node according to any one of claims 1 to 3, characterized in that: include: The first processor evaluates whether a second condition set for the first cell is satisfied; In response to the second set of conditions being met for the first cell, applying the candidate configuration for the first cell and sending a first radio signal on the first cell, the first radio signal carrying a second RRC signaling; and in response to the successful sending of the second RRC signaling, starting the first timer; The second condition set includes that the channel quality of the first cell is worse than a second threshold, the second cell is the serving cell of the first node; and the first cell is one of the at least one candidate cell.

5. The first node according to any one of claims 1 to 4, characterized in that: include: The first processor stops the first timer when the at least one candidate cell and the corresponding at least one candidate configuration are released or when a cell switching command is received.

6. The first node according to any one of claims 1 to 5, characterized in that: include: The first processor, in response to receiving the first RRC signaling, sends a first random access sequence on the second cell; The first receiver monitors a first timing advance in the first cell or in the second cell, where the first timing advance is for the first random access sequence.

7. The first node according to claim 6, characterized in that: When the first condition set is not met, the first timing advance is monitored on the first cell; when the first timing advance is not received before the first condition set is met, and the first condition set is met, and the first timer is not running, the first timing advance is monitored on the second cell.

8. A second node used for wireless communication, characterized in that: include: A first transceiver sends a first RRC signaling, where the first RRC signaling indicates at least one candidate cell and at least one corresponding candidate configuration; Wherein, whether a first condition set for a second cell is satisfied is evaluated, the second cell being one of the at least one candidate cell; a first action is performed; and the first action depends on whether the first condition set for the second cell is satisfied and a first timer; When the first timer is not running, the first action is to apply the candidate configuration for the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is a serving cell of the first node; the first timer is for the first cell and the second cell pair.

9. A method in a first node for wireless communication, characterized in that: include: receiving a first RRC signaling indicating at least one candidate cell and at least one corresponding candidate configuration; evaluating whether a first set of conditions for a second cell is satisfied, the second cell being one of the at least one candidate cell; Perform the first action; The first action depends on the first set of conditions for the second cell being satisfied and a first timer; When the first timer is not running, the first action is to apply the candidate configuration for the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is a serving cell of the first node; the first timer is for the first cell and the second cell pair.

10. A method in a second node for wireless communication, characterized in that: include: Sending a first RRC signaling, where the first RRC signaling indicates at least one candidate cell and at least one corresponding candidate configuration; Wherein, whether a first condition set for a second cell is satisfied is evaluated, the second cell being one of the at least one candidate cell; a first action is performed; and the first action depends on whether the first condition set for the second cell is satisfied and a first timer; When the first timer is not running, the first action is to apply the candidate configuration for the second cell; the first condition set includes that the channel quality of the first cell is worse than a first threshold, and the first cell is a serving cell of the first node; the first timer is for the first cell and the second cell pair.

Images